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Plant Physiol, May 2000, Vol. 123, pp. 81-92
Response to Xanthomonas campestris pv.
vesicatoria in Tomato Involves Regulation of Ethylene
Receptor Gene Expression1
Joseph A.
Ciardi,
Denise M.
Tieman,
Steven T.
Lund,
Jeffrey B.
Jones,
Robert E.
Stall, and
Harry J.
Klee*
Horticultural Sciences Department, P.O. Box 110690, University of
Florida, Gainesville, Florida 32611-0690 (J.A.C., D.M.T., H.J.K.);
Genesis Research and Development Corporation, 1 Fox Street, Parnell,
Auckland, New Zealand (S.T.L.); and Department of Plant Pathology,
University of Florida, Gainesville, Florida 32611-0680 (J.B.J.,
R.E.S.)
Although ethylene regulates a wide range of defense-related genes,
its role in plant defense varies greatly among different plant-microbe
interactions. We compared ethylene's role in plant response to
virulent and avirulent strains of Xanthomonas campestris pv. vesicatoria in tomato (Lycopersicon
esculentum Mill.). The ethylene-insensitive Never
ripe (Nr) mutant displays increased tolerance to
the virulent strain, while maintaining resistance to the avirulent
strain. Expression of the ethylene receptor genes NR and
LeETR4 was induced by infection with both virulent and avirulent strains; however, the induction of LeETR4
expression by the avirulent strain was blocked in the Nr
mutant. To determine whether ethylene receptor levels affect symptom
development, transgenic plants overexpressing a wild-type
NR cDNA were infected with virulent X.
campestris pv. vesicatoria. Like the
Nr mutant, the NR overexpressors displayed greatly reduced necrosis in response to this pathogen. NR overexpression also reduced ethylene sensitivity in
seedlings and mature plants, indicating that, like LeETR4, this
receptor is a negative regulator of ethylene response. Therefore,
pathogen-induced increases in ethylene receptors may limit the spread
of necrosis by reducing ethylene sensitivity.
1
This work was supported in part by the National
Science Foundation (grant no. IBN-9728133 to H.J.K.) and the U.S.
Department of Agriculture (grant no. 95-37304-2326 to H.J.K.). This
is Florida Agricultural Experiment Station journal series no.
R-07335.
*
Corresponding author; e-mail hjklee{at}gnv.ifas.ufl.edu; fax
352-846-2063.
© 2000 American Society of Plant Physiologists
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